:root {
    --primary-color: #1a9837;
    --secondary-color: #f8f9fa;
    --accent-color: #1a9837;
    --dark-color: #343a40;
    --light-color: #ffffff;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--secondary-color);
    color: var(--dark-color);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 15px;
}

h1 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    text-align: center;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 2rem;
}

.tool-section {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.tool-header {
    margin-bottom: 1.5rem;
}

.tool-header h2 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.icon {
    font-size: 1.5rem;
}

.file-upload {
    border: 2px dashed #ccc;
    border-radius: var(--border-radius);
    padding: 2rem 1rem;
    text-align: center;
    margin-bottom: 1.5rem;
    position: relative;
    transition: border-color 0.3s;
    cursor: pointer;
}

.file-upload:hover {
    border-color: var(--primary-color);
}

.file-upload input {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.file-upload i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.file-upload h3 {
    margin-bottom: 0.5rem;
}

.file-upload p {
    color: #666;
}

.file-info {
    margin-top: 1rem;
    font-weight: 500;
    color: var(--dark-color);
}

.text-input-container {
    margin-bottom: 1.5rem;
}

.text-input-container textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    resize: vertical;
    min-height: 150px;
    transition: border-color 0.3s;
}

.text-input-container textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(26, 152, 55, 0.2);
}

.text-controls {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    color: var(--light-color);
    padding: 0.7rem 1.5rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
    gap: 0.5rem;
    font-size: 1rem;
}

.btn:hover {
    background-color: #14852e;
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--light-color);
}

.result-area {
    background-color: var(--secondary-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-top: 1.5rem;
    text-align: center;
}

.result-area h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

#filePreview {
    margin: 1rem 0;
}

#filePreview img, #filePreview audio {
    max-width: 100%;
    border-radius: var(--border-radius);
}

.file-details {
    margin: 1rem 0;
    padding: 1rem;
    background-color: var(--light-color);
    border-radius: var(--border-radius);
}

.about-section {
    background-color: var(--light-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.about-section h2 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.about-section p {
    margin-bottom: 1rem;
}

.about-section ul {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.about-section a {
    color: var(--primary-color);
    text-decoration: none;
}

.about-section a:hover {
    text-decoration: underline;
}

/* Loading spinner */
.spinner {
    display: none;
    width: 40px;
    height: 40px;
    margin: 20px auto;
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

@media (max-width: 600px) {
    .text-controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}